$OpenBSD: patch-entry_c,v 1.1 2016/12/29 14:48:52 shadchin Exp $
--- entry.c.orig	Thu Oct 12 09:26:40 2006
+++ entry.c	Thu Dec 29 19:41:03 2016
@@ -771,10 +771,15 @@ static int writePatternEntry (const tagEntryInfo *cons
 	const int searchChar = Option.backward ? '?' : '/';
 	boolean newlineTerminated;
 	int length = 0;
+	size_t lineLength;
 
 	if (tag->truncateLine)
 		truncateTagLine (line, tag->name, FALSE);
-	newlineTerminated = (boolean) (line [strlen (line) - 1] == '\n');
+	lineLength = strlen (line);
+	if (lineLength > 0)
+		newlineTerminated = (boolean) (line [lineLength - 1] == '\n');
+	else
+		newlineTerminated = FALSE;
 
 	length += fprintf (TagFile.fp, "%c^", searchChar);
 	length += writeSourceLine (TagFile.fp, line);
